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    <a href="" class="btn btn-primary btn-xs">我是a标签</a>
    <button class="btn btn-info btn-lg">我是按钮</button>
    <input type="button" class="btn btn-danger" value="我是按钮2">
    <button class="btn btn-warning btn-sm">我是按钮</button>
    <button class="btn btn-default">我是按钮</button>
    <button class="btn btn-success">我是按钮</button>
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    <span class="glyphicon glyphicon-align-left"></span>
    <span class="glyphicon glyphicon-asterisk"></span>
    <div class="glyphicon glyphicon-ok"></div>
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